My cousin just bought a house that has 4 telephone jacks. 3 of them work but the 4th one does not have a dial tone when a phone is plugged into it(with and without dsl filter). Previous owners said they used it as a second phone line but they cancelled it with telecom years ago.
Is it possible to re-activate this second line and get a new phone number put on it?
And if the wiring hasn't been changed would it be as simple at chorus visiting an exchange and activating it or would they need to change some internal wiring in the house?